stewart



D. H. STEWART LENS ATTACHMENT MOUNT FOR PHOITOGRAPHIC APPARATUS Re. 11,537 2 Sheets-Sheet l Jan, 20, 1931. original Filed Jan, 1v, 192e III] Il Il Il Il TI- E?? D. H. STEWART LENS ATTACHMENT MOUNT FOR PHOTOGRAPHIO APPAMTU:`

Jam 2G, 1931.

original Filved Juan. 1v. 192s R- 17,937 2 SheetsmSheet" 2 gva/uml T in wwf/,Mm

Ressued an.. 20, 1931' .UNITED STATES- PATENT .f oFFlcI-:f l

DONALD n. STEWART, or EocHEsTEE, NEW YoEx, Ass1eNo:a To EasTMAN Konex COMPANY, oF ROCHESTER, NEW Yonx, A conromTToN 0E NEW Yom:

LENS-ATTACHMENT MOUNT Een EnoToGEArHIc ArPAnATUs Original-No. 1,688,441, dated This invention relates to photography and more particularly to mounts in which lens aty tachments may be carried on cameras or projectors. One object of my invention is to provide 4a mount suitable for holding a banded filter with the bands in a predetermined relation with respect to the film gate. Another object is to provide a filter mount which may be moved to and from the lijm gate, and which will not turn in its mount. Another object is to provide a mount for attachments adapted to be used with lenses which are turned in their mounts for focusing. Another object is to provide a mount which may be moved by the turning lens, therebeing a slidable connec- .focusing mechanism there has been no way of using lens attachments which require special positioning with respect to the film gate of the camera, such as .banded color filters, sky filters and'distortion attachments, although the symmetrical attachments such as plain fdters, portrait-lenses, and the like are not affected byrturning. My presentlinvention is particularly directed to overcoming these difficulties, by providing a mount in which any filter or attachment may be used on the turning lens type `of focusing camera, in which the attachment itself will not turn.

Coming now to the drawings wherein like reference character denote llike parts throughout:

Fig. 1 is a erspective view of a camera employing a ocusing objective and a lens attachment holder constructed in accordance with and embodying a preferredv form of my invention; Y l

Fig. 2 is a perspective view of an attach-l October 23, 1928, Serial No. 247,376, filed JanuaryI 17, 1928. reissue led July 16, 1930.- Serial No. 468,429. l

Application :lar

ment holder used in Fig. 1 on an enlarged scale;

Fig. 2a is a front plan viewl of a sky filter which may be used in the holder shown in Fig. 2;

Fig. 2b is a front vplan view of a prismatic lens which may be used in the holder shown in Fig. 2; j

Fig. 3 is a side elevation of the objective including an arm by which it is moved to and from the mount;

Fig. 4 is a fragmentary side elevation showing parts of the photographie apparatus employing' the focusing mechanism shown in Fig. 1;

Fig. 5 is a side elevation of a. second em'- bodiment of my invention; Fig. 6 is a front plan view\ of" the device shown. in Fig. 5; f

Fi 7 is a perspective view of still another embodiment of my invention; Fig. 8 is a third embodiment of 'my invention;

lig. 9 is a section on 1ine\9-9 of Fig. 8; an

Fig. 10 is a fragmentary perspective view of the camera shown in Fig; 1, showing the relation of the filter bands and lenticular lilm elements. 'In the following specification and claims the word objective is usedin its generic sense to include not only the glass lenses which are used to make the objective, but alsov the tubular member orv cell in which the lenses are mounted. This is done to distinguish from the lens mount which here refers to the tubular member in whichthe objective as a whole may move for focusing. Y Although my invention is equally applicable toboth photographic cameras and projectors I have here shown it as being applied -itself will not be further described.

On the ront'wall-S there. is a plate 5 at- 14m tached by screws 6 and supporting a tubular mount 7 in which an objective 8 may move for focusing. In this embodiment there is an arcuate slot 9 in the wall of tube 7, and a focusing scale 10 is provided along an 'edge of this angularly disposed slot.l An operating arm 11 extends out through the slot so that by moving this arm the walls 12 4of the slot cam the arm 11 thus moving the objective for focusing the camera.

Such structure is well known in the photographic art, being used for cameras, projectors, and other apparatus where a focusing objective is required. In accordance with my invention the lens t1'.be 7 is provided with a pair of tracks or grooves 13 which form a slideway for shoes or projections 14 carried by an annular member 15 which forms the lens attachment mount. Any desired lens attachment may be placed in this mount, although itis particularly adapted for holding color filters which may, as shown in Fig. 2, consist of a plurality of parallel vertical bands 167), 16g, and 167'. In this filter 16?) indicates a blue section; 16g, a green section; and 161", a red section, this type filter Aas being especially adapted for-use with a color process in which a special film F is used, this film having a series of minute lenticular elements L on one face A thereof, and the usual gelatino silver halid emulsion E on the opposite face thereof. Fig. 10 shows the parallel relation of the filter bands and lenticular elements.

The attachment holder may, of course, also be used with other lens attachments such as the sky filter 17 shown in Fig. 2a. This sky filter has a yellow portion 18 and al clear portion 19 such as is well known in the photographic art.

If' desired the distortion attachment 2O shown in Fig. 2b may be used, this attachment being in the form of a cylindrical lens. In both the attachments I preferably provide a registration notch 21 which may cooperatewith a lug 22 (see Fig. 4) formed on the annular member 1 5 so that the attachment may be held in the proper position with respect to the film gate G.

As the shoes 14 engage the slideways 13 it is obvious that the holderl 15 may slide in the lens mount 7 but may not turn. In order to slide the mount and tokeep it in a fixed position with relation to its distance from the lenses L1, L2. L3, and L4 which make up the objective I provide bayonet slots 23 in the edge of the tubular member carrying the lenses. the end of the tubular member, and at one end 24 extend out to the edge. y

When the handlel 1-1 in the embodiment shown in Fig. 1 has been moved in the direction indicated by the arrow to its fui-then extent of movement, portions 24 of the slot are brought into registration with vthe slide- These slots 23 are parallel to ways 13. The walls of slot 23 also form a track or slideway for the shoes 14, and when the objective is moved forward as above described the lens attachment may be pushed inwardly so that the shoes 14 engage both tracks. By moving the handle 11 in an opposite directionto that shown by the arrow to` focus the objective, theshoes 14 engage both slideways, slideway 13 preventing the holder from turning and slideway 23 movving the holder back and forth with the objective.

In order to remove the holder 15't is only necessary to move the objective forward as far as possible, at which time the ends 24 of the bayonet slots being in alignment with the grooves 13 permit the holder to slip from the lens barrel 7.

As indicatedin Fig. 4, film F whether in a camera or a projector is preferably intermittently advanced by a platen claw 25`which may be of any well known construction, this claw operating through a slot, the ends of which are indicated at 26 inthe plate 27 which holds the film in the focus of the -objective. A presser plate 28 is preferably em--` ployed, this plate having an exposure aperture 29 which is fixed with respect to the camera wall 3 and the objective mount 7. Thus by providing' the tracks 13 in the mount 7 for guiding the attachment holder 1-5 andby providing a registering device for holding the lens attachment in a fixed position relative to the holder 15, the position of the lens attachment will always be the sa,me relative to the film gate; although, of course, the distance between the film gate and the lens attachment will be altered as the objective is focused. f

In case it is desirable to equip cameras or projectors which are on the-market with an attachment holder which'retains the attachment in a definite position with respect to thelm gate, the embodiment of my'invention, lshown in Fig. 5, may be used. Herethe lens mount 37 receives the objective 39, this member being provided with a spiral groove 40 which engages a thread (not shown) Iin the lens mount 37, thus forming a quicky act-y ing screw. In order' to turn the lens Amount 39 there is anotched knul-led member 41.

The slideway for preventing the attachment mount from turning in this case consists of a pair of rails 42 supported bylugs 43 extending from the annular member 44 which may be pinched upon the lens tube 37 by means of a bolt 45. The filter mount 46, here shown as containing two filter sections 46g and 467' forv two-color photography. is provided with a pair of eyes 47 which engage lis a-slide on the rails 42, and to each side of the knurling 41 remains uncovered when the attachment is in place so that 'there is ample room for focusing the objective by turning the knurling. `The attachment holder will be moved back and forth by' the objective as before.

, When-it is desiredto remove this attachment, bolt 45 may be loosened so that-'merlu-y 1 '15 my invention in which the lens barrel 56 is equipped with slidewaysy 57 in the form of grooves into which resilient arms 58 carried by the attachment holder 59 may snap, being held in this position by spring tension. In this embodiment like that first described the attachment holder supports a filter of three sections 16b,'16g, and 167'. It should be noted that the resilient 'arms 58 are provided with an offset portion 60 which extends be- 251 yond and does not touch the` knurled edge 6l of the threadedtube 62 whichiis screwed to and from the lens'mount 56 forfocusing.

At the end of the oset 6() there is a shoulder 63 which engages the rear surface 64 of the knurled member so that when the knurled member is turned to focus the lens the filter will be moved back and forth with it, and will be prevented from turning by means of the arms 58 engaging in the slideways 57.

In all of the above described embodiments of my invention the entire objective is moved for focusing the camera. My invention is equally useful when a plied to one of the focusing objectives of tllnie type in which one or more of the lenses is moved Arelative to the others to focus a camera. Such a lens is shown in'Patent No.v 1,394,07 8, C. W. Frederick, October 18,1921.

:In Figs. 8 and 9 I have illustrated my invention as applied t0 the device shown in this patent. This type o flens is particularly useful yfor a camerafor projector having a fixed main slip'port 70 which is apertured at 71 to receive the objective here shown 'as con' sisting of lenses `L11,'L12`, L13, and L11. Since theo'bj ective is the samejasthatshown inthe patent `it will not be vnecessary to describe it further than to'V say thatL11 is movedto and from the remaining lense'sto focusthe camera barrel 74x cate the desired focus'. "A screw48'lbyjstrikfV ing' al lug? 79 prevents` the*y annularl kmember from becoming" di'sengagedjwith the thread-"- byI means of the. annular member 72fwhich" has" a threaded .engagement at y"Vt'with av it is desirable'` to have the filter designated broadly as always positioned. in a prede-` I arms are bent over at andhold the ends 86 of springs 87 anchored at 88 to the annular member 89 which i's supported by a pair of arms 90 affixed to member 7 0 in any suitablemanner, such as by screws91.

Since the distance the focusing member 7 2 moves is comparatively slight only a small range of movement of the filter member is necessary. The springs 87 draw the ends 85 of the filter arms downwardly until portions 83 of these arms are seated on the edge of the lens cell. Thus, the filter is always definitely positioned with respect to lens L11 means of the springs 87:

For preventing the filter 80 from'turning as the lens L11 is turned the annular member 89 is provided `with a track or guideway which in this instance is composed of a .pair of lugs or Aarms 92which are of sufficient Width. to closely fit about the arms 83- which support the filter. Thus the filter is guided in this track as the focusing member 72 is turned upon the thread 73, and in this way thefparallel filter bands 80?), 80g, and 801I are always held in a constant position with respectvto the film gate of the photographic apparatus on which the above described focusing lens maybe used.

It should be noted that in all of the illustrated embodiments of my invention the lens attachment holder is prevented from turning as the lens is focused, and it is held in the proper position with respect tothe objective at the same time. This is particularly useful i'n certain types of natural eblor photog- -raphy where the filter must bear a definite and fixed relation to both the objective and to the film gate, that is, in color photography of the type Where cylindrical lenticular film elements are used, the color bands of the filterGv must be parallel or substantially parallel t0.

the lenticular elements, and the filter must bel vlocated in apredetermined position withl respect to the objective.

While 1 .haveillustrated my invention'as appliedchiefly toa motion picturecamera/or., projector, IvfxloQnotWSh t0 limitit -to such. use,y'since obviously it isequally suitablefor t use '.with cameras or projectors or y:other p'ho'4v tographic apparatus in willichv an atta'Climent 'must be retained on thelo'bjectivelin such a v Wayithat vitwillmofve with the objective, and

relation to the lm ganar'`Ly latter may Having thus described my invention, what I claim as new and desire to secure by Letters Patent is,-

1. In photographic apparatus the combination of an objective, a mount for the objective in which the objective is rotatably supported for focusing, means. between the objective and mount for accomplishinga focusing movement by turningr l the objective 1n the mount, an attachment holder, and connections between the holder and the objective and between the holder and the mount for moving the attachment holder with the objective, and for preventing the attachment holder from turning.

2. In photographic apparatus the combination of an objective, a mount for the obj ective in which the objective is rotatably supported for focusing, means between the objective and mountv for accomplishing a f ocusing movement by turning the objective 1n the mount, an attachment holder slidably mounted with respect to the objective mount, and a movable connection between the objective and holder whereby the latter may be moved on its slidable mount by turning the objective.

3. 'In photographic apparatus the combination of an objective, a mount for the objective in which kthe objective is rotatably supported vfor focusing, means between the objective and mount for accomplishing a focusing movement by turning the objective in the mount, a track carried by the objective mount, an attachment holder, a shoe on the holder engaging the track whereby the holder may slide on the track and connections between the objective and holder whereby the be slid on the track by the objective mount.

4. In photographic apparatus the combination of an objective, a mount for the objective in which the objective is rotatably supported for focusing, means between the objective and mount for accomplishing a focusing movement by turning the objective in the mount, a track carried bythe objective vlnount, an attachment holder, a shoe on the holder engaging the track whereby the holder may slide on the track, and means for connecting and disconnecting the holder and objective whereby the holder may be slid by the objective.

5. In photographic apparatus the combination of an objective, a mount for the objective in which the objective is rotatably supported for focusing, means between the objective and mount forl accomplishing a focusing movement by turning'the objective in the mount, an attachment holder, means for connecting the holder to the turna-ble objective, and means includedA in the objective mount adapted to cooperate with the holder for preventing the holder from turning as it is moved by the objective.

6. In photographic apparatus the combination of an objective, a mount for the objectivel in which the objective is rotatably supported for focusing, means between the objective and mount for accomplishing a focusing movement by turning the objective in the mount, a slideway carried bythe objective, a slideway carried by the mount, an attachment holder, means on the holder engaging the slideways whereby the holder will be moved through one slidcway and held against turning by the other slideway.

7 In photographic apparatus, the combination with a fixed lens mount, of an objective movable longitudinally of the mount, a banded filter adapted to be supported on the mount, means for holding the bands of the filter in a definite position with respect to the lens mount, and means including the objective for moving the banded iilter with the objective longitudinally of' the mount.

8. In photographic apparatus, the combl nation with a fixed lens mount, of an objective movable longitudinally of the mount, a filter having a plurality of color sections adapted to be support-ed on the apparatus, a holderffor the filter, and means included in the holder and cooperating with the objective and mount to retain the filter bands in a fixed position relative tothe mount and -at a fixed distance from the objective,

9. In photographicapparatus, the combination with a fixed lens mount, of an objective relatively movable longitudinally of the l to the objective, andV means for holding the attachment holder against turning. 1

1l. In photographic apparatus, the combination with a movably mounted objective, of a relatively fixed lens mount, an attachment holder adapted to be used with the objective, means tending to hold the attachment holder a predetermined distance from the objective,

and separate means for holding the'attachi ment holder from turning with respect tothe relatively fixed lens mount.

l2. In photographic apparatus, the combination with a movably mounted objective, j

of a relatively fixed lens mount, an attachment holder, a banded filter in the holder adapted to be positioned a predetermined distance from the objective, means for holding the filter in the desired position, and separate means for registering the banded lter with respect to the relatively fixed lens mount.

13. In photographic apparatus, the combination with a lens mount, of an objective movably carried in the mount being vadapted to turn therein for focusing, an attachment` holder adapted to be used with the objective, means including a member attached to a fiXed part of the apparatus for non-rotatably supporting the attachment holder, said means also including a guideway permitting movement of the holder with the objective as the latter is turned for focusing.

14. In photographic apparatus, the combination with a lens mount, of an objective movably carried in the mount being adapted to turn therein for focusing, an attachment holder adapted to be used with the objective, means including amember attached to a fixed part of the apparatus for non-rotatably supporting the attachment holder, said means also including a guideway permitting movement of the holder With the objective as the latter is turned for focusing, and mechanism for holding the attachment holder in a predetermined position With respect to the objective. f

15. In photographic apparatus,r the combination VWith a lens mount, of an objective adapted to turn in the lens mount for focusing, a film gate adapted to receive photographic film including a plurality of lenticular elements having a definite relation, to

'the film gate, a color filter including a plurality of light transmitting color bands adapted to be used with the objective, means for holding the filter against the objective, and means including a slideway for holding the color bands in a predetermined position 1wt/ith respect to the lenticular elements of the 1m 16.. In photographic apparatus, in combination, an exposure gate, means for holding a photographic element at said gate, an 0bjective support in alignment With the gate,

an objective carried by the support, at least a part of said objective being mounted for y helical movement in said support to focus the objective, an unsymmertical optical element for use With said objective to modify the image made by said objective, a holder for said element carried by the apparatus in alignment with the objective, said holder being connectedy to the movable objective part for longitudinal movement therewith, and means for locating said holder in a definite predetermined position with respect to the gate and preventing said holder from turning with the objective part.

17. An accessory for a camera having a lens casing comprising a fixed section and an adjustable section, said accessory comprising a support for a color screen and parts for detachably engaging the fixed section of the lens casing of the camera for mounting the color screen over the outer end of the movable section of the lens casing.

18. An accessory for a camera having a lens casing comprising a fixed section and an adjustable section, said accessory comprising parts to enable it to be detachably mounted on said fixed section, and a movable color screen to be mounted over the end of the adjustable section, said accessory and said adjustable section having parts-Which so engage that said movable screen and said adjustable section are moved in unison.

19." An accessory for a camera having a lens casing comprising a fixed section and an adjustable section, said accessory comprising arms for detachably gripping the fixed section to mount the accessory in position, a movable holder carrying a color screen to be supported over the outer end of the ad.- justable section, and means on said holders engaging the adjustable section so that the holder and screen are moved with the adjustable section'vvhen the latter is adjusted.

20. An accessory for a camera. comprising a fiXed section and an adjustable section, the accessory having a stem detachably mounted on the fixed section, a holder' for a color screen connected to said stem to be mounted over the end of the adjustable section, and parts on the adjustable section and the stem to cooperate'with said holder so that when the adjustable section is moved the screen moves in unison therewith.

Signed at Rochester, N. Y., this 14th day of July 1930. Y

DONALD H. STEWART. 

